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Education 5 min read Updated

How Much Is a 1.5 Carat Lab Grown Diamond?

By Yareli, Founder and Designer

Real Prices From Our Diamond Search

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A 1.5 carat diamond is a clear step up in size from a 1 carat. Lab-grown, it costs a fraction of a natural stone, and the top grades add surprisingly little. Here is what one costs in our diamond search, how big it looks on the hand, and what a finished 1.5 carat engagement ring costs.

The experts you can trust: Mine & Grown guides are written with jewelry experts and reviewed for accuracy. Questions about a specific piece? Our team is happy to help.

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What a 1.5 Carat Lab-Grown Diamond Costs

In our diamond search in October 2026, eight in ten 1.5 carat round lab-grown diamonds with G color or better, VS2 clarity or better and an Excellent cut cost $500 to $850, each with an IGI or GIA grading report, and the full range runs from $400 to $6,500. We count stones from 1.50 to 1.59 carats with photos, leave out the cheapest and the most expensive tenth for the first range, and round every range out to round numbers.

For the other eight shapes, the eight-in-ten ranges together run from $500 to $2,500; the table below gives each shape's own range. Each loose diamond is sourced for your order and arrives in about 2 to 3 weeks.

1.5 Carat Lab-Grown Diamond Price Ranges by Shape, October 2026

ShapeEight in ten costLowest to highest
Round$500–$850$400–$6,500
Oval$550–$1,000$400–$4,250
Pear$550–$1,250$400–$3,000
Emerald$500–$1,250$400–$4,000
Radiant$500–$1,250$350–$3,500
Cushion$500–$900$400–$4,000
Marquise$600–$2,500$500–$8,500
Princess$500–$700$400–$5,000
Asscher$500–$750$400–$3,750
Valencia oval three-stone bezel engagement ring in yellow gold on green velvet

How Much Do the Grades Matter?

Less than you might expect. In our search, eight in ten 1.5 carat rounds with top grades, D to F color, VVS2 clarity or better and an Ideal cut, cost $500 to $900, against $500 to $850 for G color or better, VS2 clarity or better and an Excellent cut, and the middle price is only about 3% higher. For lab-grown diamonds the top grades are often worth that small step up.

Cut still matters most for sparkle, so keep it Excellent or Ideal. Our guide The 4 C’s of Buying Diamonds explains each grade.

Odessa oval bezel engagement ring worn on the hand

Just Under 1.5 Carats Costs Less

Prices step up at popular weights like 1.5 carats. In our search, eight in ten rounds from 1.40 to 1.49 carats cost $400 to $900, against $500 to $850 from 1.50 to 1.59 carats, and the middle price is about 14% lower, while they look almost the same size on the hand.

Search the full range in our 1.5 carat and 1 carat diamond searches.

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How Big Is a 1.5 Carat Diamond?

In our search, a typical 1.5 carat round measures about 7.4 mm across. Elongated shapes spread the same weight over a longer outline: a typical 1.5 carat oval measures about 9.2 by 6.5 mm, a pear about 10.2 by 6.4 mm and an emerald cut about 7.9 by 5.5 mm.

Our guide Understanding Diamond Size Before You Buy shows how carat weight translates into size. For the sizes either side, see How Much Is a 1 Carat Lab Grown Diamond? and How Much Is a 2 Carat Lab Grown Diamond?.

Valencia emerald three-stone bezel engagement ring in yellow gold on green velvet

What a 1.5 Carat Engagement Ring Costs

Our engagement rings with a 1.5 carat lab-grown center diamond cost $1,000 to $3,500, and with a 1.5 carat natural center $8,500 to $20,000, across every design, metal and diamond grade. The setting is made to order in our Chicago studio in about 4 to 6 weeks.

See How Much Does an Engagement Ring Cost in 2026? for every size, metal and diamond origin.

Selene oval engagement ring worn on the hand

Lab-Grown vs Natural at 1.5 Carats

A 1.5 carat lab-grown diamond is a real diamond with the same hardness and sparkle as a natural one, and the price gap grows with size: a ring with a 1.5 carat natural center costs about 4 to 11 times as much as the same ring, in the same metal and grade, with a lab-grown one. Both come with an IGI or GIA report that states the diamond's origin.

Read Natural vs Lab-Grown Diamonds for how they compare beyond price.

Frida oval engagement ring worn on the hand

How to Choose a 1.5 Carat Diamond

  1. Keep the cut Excellent or Ideal. It decides the sparkle.
  2. Consider top color and clarity. For lab-grown, they often cost only a little more.
  3. Look just under 1.5 carats if you want the same look for less.
  4. Check the photos and 360° view of each stone, and open its IGI or GIA report.
  5. Ask us. Yareli, our founder and designer, can compare diamonds with you by video or phone.

1.5 Carat Diamond FAQ

Find a topic

How much is a 1.5 carat lab grown diamond?

In our search in October 2026, eight in ten 1.5 carat round lab-grown diamonds with G color or better, VS2 clarity or better and an Excellent cut cost $500 to $850, each with an IGI or GIA report.

How big is a 1.5 carat diamond?

A typical 1.5 carat round measures about 7.4 mm across; a 1.5 carat oval about 9.2 by 6.5 mm.

Are top grades worth it for a 1.5 carat lab grown diamond?

Often, yes: in our search, eight in ten 1.5 carat rounds with D to F color, VVS2 or better and an Ideal cut cost $500 to $900, against $500 to $850 for G color or better, VS2 or better and an Excellent cut.

How much is a 1.5 carat lab grown engagement ring?

Our rings with a 1.5 carat lab-grown center cost $1,000 to $3,500, depending on the design, the metal and the diamond grade.

How much more does a 1.5 carat natural diamond cost?

On our rings, the same design in the same metal and grade costs about 4 to 11 times as much with a 1.5 carat natural center as with a lab-grown one. Our finished rings cost $8,500 to $20,000 with a natural center and $1,000 to $3,500 with a lab-grown one.

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